Fix KCM key mapping cloning

ag/23792288 tried to fix a security issue by cloning the key
mappings, but unfortunately the parcel was not being rewinded.

Bug: 274058082
Test: Confirmed change works in newer Android versions
Merged-In: I745008a0a8ea30830660c45dcebee917b3913d13
Change-Id: I6f75b9202e20d82ebf81a35a2916e653ee1b8372

core/jni/android_view_InputDevice.cpp

@@ -53,6 +53,7 @@ jobject android_view_InputDevice_create(JNIEnv* env, const InputDeviceInfo& devi
     if (map != nullptr) {
         Parcel parcel;
         map->writeToParcel(&parcel);
+        parcel.setDataPosition(0);
         map = map->readFromParcel(&parcel);
     }